are the eternals related to the inhumans

Inhumans are distinguishable by one or two abilities that set them apart from everyone else, but the Eternals, who are fueled by cosmic energy, are more powerful and more unique.

Eternals are a race of superhumans that were engineered by the Celestials about a million years ago. They are immortal and almost completely indestructible (which makes Ajax USELESS imo for this movie as you see her healing her partners...). They all possess the same abilities plus one or more very different abilities. Most importantly, they look human. If in the extremely rare chance one happens to kill the body of an Eternal, the consciousness would instantly download into another body that is an exact copy of the original.

Inhuman’s are another group, who as a result of genetic tampering by the Kree, will manifest powers when they are exposed to Terrigen. An Inhuman will always undergo a physical change that will alter their appearance. Some changes are more extreme than others but there is always a physical change, related to whatever power that mainfests that identifies them as not human. As is the case with Mutants and Superhumans, Inhumans can manifest very diverse powers.